What will typically trigger a DP system alert regarding heading error?

The correct answer involves the situation where there is a heading difference between primary and secondary gyros. This is significant because dynamic positioning (DP) systems rely on accurate heading information from various sensors to maintain the vessel's position and orientation. If there is a notable discrepancy in the readings from different gyros, it indicates a potential issue with the reliability of the heading data.

This alert mechanism is crucial for safe operations; when the system detects that the headings differ beyond acceptable limits, it prompts an alert to the operators. The operators can then investigate the source of the error—whether it be a malfunctioning sensor or a calibration issue—to ensure the DP system can function effectively. Accurate heading information is vital for maintaining the vessel's intended course, particularly in challenging environmental conditions.

In contrast, uncalibrated thrusters generally lead to thrust discrepancies rather than directly triggering a heading error alert. Coordination between multiple sensor readings usually serves to create a more comprehensive picture of the vessel's state rather than indicating an immediate problem. A loss of engine power can affect the vessel's ability to maintain position, but it does not specifically relate to the heading error alerts generated by discrepancies in gyro readings. Thus, the correct choice directly addresses the core function of maintaining accurate heading in a